IEEM gGmbH - Institut für Umwelttechnik und Management an der Universität Witten/Herdecke

Mega City Lima

Projekttitel: Megacity Lima (Water supply and wastewater in megacities of tomorrow - concepts for metropolitan Lima (Peru)
Projektleiter: Dr. Manfred Schütze (IFAK Magdeburg)
Projektpartner: IFAK Magdeburg; TU Müchen; DIALOGIK; Siemens AG; Hans Huber AG
Förderer: BMBF (“Research for Sustainable Development of Megacities of Tomorrow“)
Kennzeichen: 01LG0512
Projektlaufzeit: Juli 2005 - Juni 2007

Current situation in Lima regarding water supply and wastewater management

The capital of Peru, Lima, with a fast growing population exceeding 8 million to be considered as a megacity, has to draw a major part of its water supply from River Rimac. Due to very dry conditions (average annual rainfall of 9 mm) and large seasonal variations of river flow, also groundwater is being used as a source of water supply. Groundwater abstraction is in excess of the capacities available.

As of today, 86 % of the population is connected to the public water supply. An annual population growth of 2,1 % and leakages in the pipe network lead to problems in water supply, despite major efforts undertaken in the last years.

About 81 % of the population are connected to the sewer network. A large fraction of the wastewater (almost 90 %) flows into the ocean without any treatment. This leads to pollution and the endangerment of the aquatic flora and fauna. Bathing on the city's beaches is discouraged. Part of the untreated wastewaters is also used for irrigation, thus constituting a health risk to the population.

Fig. Treated wastewaters in Lima
Figure: Treated wastewaters in Lima from 1996 to 2004
(red line/grey bars: treated wastewaters; yellow bars: collected wastewaters)
Source: Sedapal Lima


Objective of the "LIWA" Project


The core objectives of the "LiWa" project (Water supply and wastewater in megacities of tomorrow - Concepts for Metropolitan Lima (Perú) and elsewhere -) consists in the development, planning and implementation of new concepts for the improvement of water supply and sanitation in Lima.

The solution strategies to be developed should consider the local situation and boundary conditions; furthermore, these should be efficient and sustainable, with regards to technological, economical, social and ecological aspects.

One of the key aspects of the project lies in the development and test of new systems for wastewater treatment which appear to be promising for fast growing megacities such as Lima. It is envisaged to develop a prototype application during the first phase of the project.

Aspects of the "LiWa" project:

  • Investigation of potential of innovative wastewater treatment technologies

  • Evaluation of the concepts under technological, ecological and socio-economic aspects

  • Modelling and simulation of urban water systems

  • Ensuring of communication and public participation in the decision finding process

  • Development of a prototype system

  • Evaluation of concepts for data communication for water and wastewater systems

  • Development of a guideline document and of recommendations for the implementation of innovative systems, applicable also for other cities.

  • Implementation of results

  • Feeding of project results into research and education in Perú and in Germany

  • The German-Peruvian project team is composed of scientific experts, industrial specialists and representatives from local governments and NGOs with strong expertise in water and wastewater management.

    The project consists of two phases: a preparatory phase (2005-2007) and a main phase (from 2007 onwards). During the preparatory phase, the situation in Lima will be analysed in detail and contacts with governmental and non-governmental institutions will be set up and strengthened. This will lead to a detailed project plan for the subsequent main phase of nine years. Subject to funding by BMBF also for the main phase, the concepts developed will be tested and implemented.